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pieterjanheyse
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Expanding an AF VSAN cluster by adding SSD's

We have an alls flash VSAN cluster consisting of 7 hosts and would like to expand the storage capacity.

Current config per server is:

- 1 x 800GB Intel P3600 NVMe drive

- 2 x 1.2TB Intel S3610 2,5" SSD

Since the S3610 is not for sale anymore, the suggestion is to add one or two (NVMe/SSD ratio still seems ok then) D3-S4610 drives, also from Intel. Those drives are available in 960TB or 1.9TB and that raised the question. Can I add either type to my hosts and what is the capacity impact?

If I add the 960GB disks, will vsan still work and balance all the data over all the SSD's?

If I add the 1.9TB variant, will the capacity grow by 1.2TB per disk (because I already have 1.2TB SSD's) or will it use the complete 1.9TB?

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TheBobkin
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Hello Pieter,

"Can I add either type to my hosts and what is the capacity impact?"

You can and it will increase vsanDatastore capacity by that amount.

"If I add the 960GB disks, will vsan still work and balance all the data over all the SSD's?"

Yes,  you can start rebalance task from vSAN Health UI or RVC - only data on disks over 80% used gets moved automatically otherwise.

"If I add the 1.9TB variant, will the capacity grow by 1.2TB per disk (because I already have 1.2TB SSD's) or will it use the complete 1.9TB?"

It will use the complete amount. Note it is advised to use the same size capacity-tier devices if using deduplication.

Bob

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TheBobkin
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Hello Pieter,

"Can I add either type to my hosts and what is the capacity impact?"

You can and it will increase vsanDatastore capacity by that amount.

"If I add the 960GB disks, will vsan still work and balance all the data over all the SSD's?"

Yes,  you can start rebalance task from vSAN Health UI or RVC - only data on disks over 80% used gets moved automatically otherwise.

"If I add the 1.9TB variant, will the capacity grow by 1.2TB per disk (because I already have 1.2TB SSD's) or will it use the complete 1.9TB?"

It will use the complete amount. Note it is advised to use the same size capacity-tier devices if using deduplication.

Bob

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pieterjanheyse
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Very clear, thanks for your time, Bob.

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